Lac Petagumksun is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 54° 31' 40'' North   (decimal: 54.5277778)
• Longitude: 72° 1' 24'' West   (decimal: -72.0233333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Petagumksun
• GPS Coordinate Locator Map: Lac Petagumksun Lat/Long